President Trump said on Monday that he would be open to meeting with President Hassan Rouhani of Iran, and would even be willing to support short-term loans to get Tehran through its current financial difficulties if talks open.

Mr. Trump was responding to an overture by President Emmanuel Macron of France, who said that he would try to set up such a meetingin the next few weeks, to seek a resolution of decades of conflict between Iran and the United States.

Mr. Macron, who said he had spoken with Mr. Rouhani, said that if the American and Iranian presidents met, “my conviction was that an agreement can be met,” addressing Iran’s nuclear ambitions and its destabilizing actions in the Middle East.

Joining Mr. Macron at a news conference at the end of the Group of 7 summit meeting, Mr. Trump expressed openness to such a meeting.

“If the circumstances were correct or right, I would certainly agree to that,” the president said. “But in the meantime, they have to be good players. You understand what that means.”

Mr. Trump said he was not seeking regime change, but if Iran infringed on American national interests, “they’re going to be met with really violent force.”

Mr. Trump has repeatedly castigated former President Barack Obama for the 2015 nuclear deal that unfroze billions of dollars belonging to Tehran, and has imposed sanctions that have damaged the Iranian economy. But he said on Monday that he would go along with “a short-term line of credit or loan” to Iran, secured by oil.

“We’re talking about a letter of credit,” he said. “It would be from numerous countries.”

A meeting between American and Iranian leaders would be the first since the United States Embassy was stormed and American diplomats were taken hostage in 1979, resulting in a 444-day standoff and four decades ofhostility. Mr. Obama talked with Mr. Rouhani by telephone in 2013, but the Iranian leader, under pressure from hard-liners in his country, refused to meet in person.

Mr. Macron’s bid to bring the two leaders together came a day after he invited Foreign Minister Mohammad Javad Zarif of Iran to Biarritz for a surprise, last-minute visit. Mr. Zarif held talks with French, German and British officials, but Mr. Trump declined to see him.

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President Trump said on Monday that Chinese officials had called to restart trade talks with the United States. That came after China imposed new tariffs in retaliation for American levies on Friday.CreditCreditErin Schaff/The New York Times

Trump pivoted again on China, turning down the heat on the trade war — for now.

President Trump shifted tone on his trade war with China yet again on Monday, calling President Xi Jinping of China a “great leader” just three days after branding him an “enemy” of the United States.

Mr. Trump said that Chinese officials had reached out by telephone and that the two sides would soon restart trade talks, after the latest escalation in tariffs and his “order” to American companies to look for ways to pull out of China.

“We were called and we’re going to start very shortly to negotiate,” Mr. Trump said as he met with President Abdel Fattah el-Sisi of Egypt on the sidelines of the Group of 7 summit meeting in Biarritz, France. “We’ll see what happens, but I think we’re going to make a deal.”

While Mr. Trump originally said the American side had received two phone calls, Beijing did not immediately confirm any, and the editor of a newspaper owned by the Chinese Communist Party tweeted that there had been no significant contacts in recent days. Asked later about that, Mr. Trump was somewhat more cryptic but insisted that there had been communication “at the highest level.”

Either way, Mr. Trump appeared to be toning down a conflict that has battered world financial markets, hours after China’s chief negotiator did the same.

“We are willing to resolve the issue through consultations and cooperation in a calm attitude and resolutely oppose the escalation of the trade war,” said Liu He, the Chinese vice premier. “We believe that the escalation of the trade war is not beneficial for China, the United States nor to the interests of the people of the world.”

Mr. Trump has pivoted repeatedly in his language on the conflict in recent days. On Friday, after China imposed new tariffs in retaliation for American levies, Mr. Trump said he “hereby ordered” American companies to start leaving China and vowed to increase his own tariffs. He referred to Mr. Xi as an “enemy.”

On Sunday, Mr. Trump said he had had “second thoughts” about the escalation. But within hours, aides rushed out statements saying that his only regret was that he had not been even tougher on China.

G7 leaders address fires ravaging the Amazon rainforest.

Mr. Macron and President Sebastián Piñera of Chile said they also had reached an agreement in principle with the countries of the Amazon basin for a long-term program of forest protection and reforestation of cleared lands. They said more details might be presented next month at the United Nations General Assembly.

The announcements followed a session on climate, the oceans and biodiversity that included representatives of several countries that are not members of the Group of 7.

President Trump, who was holding meetings with other leaders, did not attend that session. The White House press secretary, Stephanie Grisham, said a senior member of the administration took part instead.

With tens of thousands of fires currently burning, it is not clear how far $20 million will go in combating them. Mr. Piñera said the affected countries particularly needed specialized aircraft and specially trained and equipped fire brigades.

Mr. Macron and the German chancellor, Angela Merkel, have called the Amazon fires a global crisis and a significant contributor to climate change, and insisted that the Group of 7 address it.

The fires accelerate depletion of one of the world’s largest forests, a crucial sink for the atmospheric carbon dioxide that contributes to global warming. They also threaten Indigenous peoples and shrinking wildlife habitat.

Even before the recent fires, deforestation had accelerated since Jair Bolsonaro became Brazil’s president in January, and environmental groups have accused him of encouraging it. Fires in the Amazon are often set intentionally — and illegally — to clear forests for farming or ranching.

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Mr. Trump, a presidential candidate at the time, held an event with employees at the Trump National Doral resort in Miami in 2016.CreditEric Thayer for The New York Times

Trump is considering holding the next G7 meeting at one of his resorts.

The president, who is scheduled to host the 2020 meeting as part of the usual rotation among member nations, told reporters that he was considering a site in Doral near Miami International Airport, almost certainly referring to the Trump National Doral, although he did not use the name.

“It’s a great place,” Mr. Trump told reporters during a meeting with Chancellor Angela Merkel of Germany. “It’s got tremendous acreage, many hundreds of acres, so we can handle whatever happens. It’s really — people are really liking it and plus it has buildings that have 50 to 70 units. And so each delegation can have its own building.”

Critics had already accused Mr. Trump of taking advantage of his presidency to make money through his properties. The use of one of his resorts for an international summit meeting would raise many questions, including whether and how much the government would pay for the premises, and how much Mr. Trump would profit from it.

The Washington Post reported in June that the president had suggested the Doral property to aides as a site for the 2020 Group of 7 meeting.

“They love the location of the hotel,” he said on Monday. “And they also like the fact that it’s right next to the airport, the convenience. And it’s Miami, Doral Miami. So it’s a great area. We haven’t found anything that could even come close to competing it, really competing with it, especially when you look at the location being right next to the airport.”

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A protest in Srinagar, Kashmir, this month after India terminated the region’s autonomy.CreditAtul Loke for The New York Times

Modi rebuffed Trump’s offer to mediate the dispute over Kashmir.

Prime Minister Narendra Modi of India on Monday declined President Trump’s offer to mediate the escalating dispute with Pakistan over the territory of Kashmir, saying that he did not want to involve any other country in the matter.

“These issues are bilateral,” Mr. Modi said as he sat with Mr. Trump on the sidelines of the Group of 7 meeting.

This month, Mr. Modi’s government terminated the autonomy of the part of Kashmir controlled by India, and severed communications to the impoverished region in the Himalayas, long been claimed by both India and Pakistan. Indian forces rounded up more than 2,000 Kashmiris in a crackdown in the days before and after the move, local officials have told The New York Times.

Speaking with reporters in Biarritz before his meeting with the Indian prime minister, Mr. Trump offered no criticism of India’s action and deferred to Mr. Modi’s preference that the United States keep out of the matter.

“The prime minister really feels he has it under control,” Mr. Trump said.

Asked whether his offer to mediate was still on the table, Mr. Trump said, “I’m here, if for any reason, but I think they can do it themselves, though. They’ve been doing it for a long time.”

Prime Minister Imran Khan of Pakistan told The Times last week that Mr. Modi and his government had rebuffed all entreaties to talk and essentially threw up his hands at the prospect.

“There is no point in talking to them,” Mr. Khan said. “I mean, I have done all the talking.”

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President Emmanuel Macron has emerged as one biggest critics of President Jair Bolsonaro of Brazil.CreditPool photo by Ludovic Marin

Amazon dispute gets personal for the leaders of France and Brazil.

Mr. Bolsonaro shared a Facebook post on Sunday that mocked the looks of the French president’s wife. Mr. Macron hit back on Monday, calling him “sad” and ill-behaved, and even going so far as to say that he hoped Brazil would soon have a different leader.

“We can’t accept that a president, Macron, fire baseless and gratuitous attacks at the Amazon, nor that he disguise his intentions behind the idea of an ‘alliance’ of G7 countries to ‘save’ the Amazon, as if we were a colony or a no-man’s land,” he wrote.

Trump says he knew in advance that Iran’s foreign minister would be in Biarritz.

President Trump on Monday endorsed the surprise French move to bring Iran’s foreign minister to Biarritz during the Group of 7 meeting, saying he had been asked in advance and had no objection. But he said he had declined to meet with the minister.

President Emmanuel Macron of France, who has tried to preserve the landmark 2015 international nuclear agreement with Iran that Mr. Trump has abandoned, extended a last-minute invitation to Foreign Minister Mohammad Javad Zarif to hold talks on the sidelines of the summit.

Mr. Zarif’s arrival on Sunday caught many diplomats and the news media by surprise. He has met with Mr. Macron, the French foreign minister and officials from Britain and Germany.

Speaking with reporters, Mr. Trump said he had given his blessing for the meetings.

“I spoke to President Macron yesterday, and I knew everything he was doing,” Mr. Trump said. “And I approve whatever he was doing. And I thought it was fine.”

“I think it’s too soon to meet, I didn’t want to meet,” Mr. Trump said. “But it’s true there’ll be time to meet with Iran, and it’s going to be a great thing for Iran. They have a great potential.”

He again criticized the 2015 nuclear deal but said he would like to strike a better agreement that would be beneficial to Tehran if it gives up support for international terrorism. “We’re looking to make Iran rich again,” he said.

Peter Baker reported from Biarritz, France. Reporting was contributed by Aurelien Breeden from Paris, Michael Shear from Biarritz, Richard Pérez-Peña from London and Claire Fu from Beijing.